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This sequence of photos with two under-cabinet fixtures spaced 24", 12", 6", and finally 1" apart shows that a dimly lit band continues to be evident on the backdrop until the fixtures are butted end to end. This area is 16" deep with the bottom of the fixture 13" above the layout, the top 15". away from the backdrop, the dim band might have been muted by overlapping light, but the intensity of light on the layout would have dropped. I used Phillips C50 tubes, which should provide a color close to sunlight (5,000 vs. the Sun's 5,600 Kelvin036hence C50). To my eye, they look colder than cool-white tubes, and the blue of the backdrop appeared deeper than with cool-white tubes. Cool whites also seem brighter, and perception is everything when it comes to lighting and color. The jury's still out on whether I'll equip the entire railroad with C5Os, use cool whites as on the Allegheny'Midland, or find another flavor I like even better. But for simulating a typical Midwest-, ern or Appalachian cloudy-bright day, cool-white fluorescents are hard to beat. Also note that the design of the under-cabinet fixture places the tube well in from the aisle - about 414" in froin the valance. I always locate the track closest to the aisle 6" in from the edge (for elbow protection), so the center line of each tube is almost above the track. Though this backlights structures close to the aisle, room lighting helps to avoid harsh shadows, as shown in the photos on page 80. I want to be sure that train crews and agent-operators have enough light ' to read car numbers. Aisle lighting helps. i Nighttime operations When I was growing up in the 195Os, I saw a lot of action on the NKP's St. Louis line after dark when I sneaked down to the interlocking tower that guarded the NKP Chicago & Eastern Illinois crossing at Cayuga, Ind. To simulate that kind of nighttime i operation, I'd like to be able to dim the lights to darkness. Since I'm zising common fluorescent fixtures without dimmable electronic ballasts (those can be very expensive), dimming lamps from daylight to full dark is difficult. I'm still looking into night-lighting alternatives. Some I've come up with so far don't require fancy circuitry - only a light switch! I could036perhaps, operate